68C05
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Poljak, Svatopluk; Turzík, Daniel; Pudlák, Pavel:
Extensions of $k$-subsets to $k+1$-subsets - existence versus constructability.
(English).
Commentationes Mathematicae Universitatis Carolinae,
vol. 23
(1982),
issue 2,
pp. 337-349
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Demel, Jiří:
Fast algorithms for finding a subdirect decomposition and interesting congruences of finite algebras.
(English).
Kybernetika,
vol. 18
(1982),
issue 2,
pp. 121-130
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